A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5935-00-885-5597
NSN 6240-00-903-4660
NSN 5905-01-367-5578
NSN 6610-00-135-9625
NSN 5855-01-256-2551
NSN 6150-01-017-4654
NSN 5996-00-373-9001
NSN 5996-01-503-8589
NSN 5920-00-140-8912
NSN 5855-00-494-9581
NSN 5945-01-532-1777
NSN 6320-00-110-8005